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Stock-Based Incentive Compensation Plans and Employee Benefit Plans - Change in Control Agreements and Other Employee Matters (Details) $ in Millions		12 Months Ended
	Jul. 21, 2021 USD ($)	Dec. 31, 2023 severance
Concentration Risk [Line Items]
Maximum number of times annual salary included in severance benefits | severance		3
Board of Directors Chairman
Concentration Risk [Line Items]
Lump sum cash payment for separation | $	$ 28
Workforce Subject to Collective Bargaining Arrangements | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		40.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in May 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		17.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		2.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in April 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		5.00%
Workforce Subject to Collective Bargaining Arrangements Expiring December 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		3.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		3.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		5.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in June 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		3.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in September 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Workforce Subject to Collective Bargaining Arrangements, Expiring in October 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		2.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		53.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in May 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		53.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in April 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring December 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in September 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements, Expiring in October 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		48.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in May 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		2.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in April 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		13.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring December 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		8.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		7.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		13.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		1.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in September 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		0.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements, Expiring in October 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percent)		4.00%

X

- Definition

Maximum number of times annual base salary included in severance benefits for certain officers in a change of control (in number of times)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cash outflows for payments of postemployment benefits (such as severance pay and health insurance benefits) recognized during the period. Postemployment benefits are benefits paid to employees after employment but before retirement.

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